降雪对沈阳市大气颗粒物清除作用的研究

Study on the effect of snowfall on the scavenging of the atmospheric particles in Shenyang

选取2014年12月~2018年12月大气颗粒物浓度数据和气象数据资料,分析了降雪对大气颗粒物浓度的清除作用,研究结果表明:降雪对大气颗粒物浓度具有明显的清除作用,清除效果因小时降雪量、降雪持续时间及降雪总量的影响而变化。从平均清除效率来看,小时降雪量在0.1~0.9mm和大于2.0mm范围,降雪持续时间小于5h和大于10h,降雪量小于2.4mm和大于10mm,降雪对大气颗粒物的清除效果较好,清除作用较为明显。当降雪前PM10浓度超过150μg/m3和PM2.5浓度超过75μg/m3时,降雪发挥较为明显的清除作用。

Based on the atmospheric particulate matter concentration data and meteorological data during the winter of from December 2014 to December 2018,we analyzed the influence of snowfall on the atmospheric particulate matter concentration in Shenyang.The results showed,snowfall had a scavenging effect on the concentration of atmospheric particulate matter.The scavenging effect varied with hourly snowfall,snowfall duration and total snowfall.From the perspective of average scavenging efficiency,when the hourly snowfall was in the range of 0.1-0.9 mm and greater than 2.0 mm,the snowfall duration less 5 h and exceeded 10 h,the total snowfall was less than 2.4 mm and greater than 10 mm,snow scavenging had a good effect on the scavenging of atmospheric particulate matter.When the concentration of PM10 exceeded 150μg/m3 and the concentration of PM2.5 exceeded 75μg/m3 before the snowfall process began,the snow scavenging effect was more obvious.